Feedback Current Capture Circuit for Cold-Weather Regenerative Braking
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Solution Overview
Problem
Electrically driven aerial equipment experiences high-frequency pulse feedback currents during regenerative braking at low temperatures, leading to lithium precipitation and thermal runaway risks in lithium-ion batteries, which existing heating devices inadequately address.
Innovation Solution
A feedback current control device with a current capture module, switch modules, and a control module to manage and divert feedback currents away from the battery at low temperatures, using a braking resistor to convert energy and regulate charging currents based on voltage and temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating device is configured inside the battery to heat the battery at low temperature, then the battery temperature can be raised to avoid lithium precipitation, but the heating power is limited and the temperature rise rate is slow (around 10°C/h), which takes a long time and affects equipment usability
Solution Approach 1:
The control module detects battery temperature in advance before regenerative braking occurs. When low temperature is detected, it pre-configures the current capture circuit to be ready, so that when feedback current occurs, the circuit is already prepared to capture it immediately, avoiding the need for time-consuming heating processes
Solution Approach 2:
The patent introduces a current capture circuit with switching modules as an intermediary between the driver and battery. This intermediary circuit captures feedback current through the switching module when the battery is at low temperature, preventing direct charging that would cause lithium precipitation, thus solving the safety issue without requiring heating time
2Use of energy by moving object
If the aerial equipment uses regenerative braking technique to slow down or stop, then energy can be recovered by converting kinetic energy to electric energy and feeding it back to the power battery, but this generates high instantaneous pulse feedback current at low temperature which causes lithium precipitation and thermal runaway risks
Solution Approach 1:
The patent employs dynamic control of the current capture circuit through the switching module. The circuit dynamically switches between connected and disconnected states based on real-time battery temperature and operating conditions. When low temperature and regenerative braking are detected, the switching module connects the current capture circuit to capture feedback current; otherwise, it disconnects to allow normal charging, thus enabling energy recovery while preventing lithium precipitation and thermal runaway risks
Solution Approach 2:
The control module continuously monitors battery temperature and operating state, and uses this feedback information to control the switching module. When the battery temperature is low and regenerative braking is detected, the feedback signal triggers the switching module to connect the current capture circuit, capturing the feedback current and preventing it from charging the cold battery, thereby avoiding lithium precipitation and thermal runaway while still allowing energy recovery under appropriate conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents lithium precipitation and thermal runaway by capturing and consuming feedback currents, maintaining battery safety and extending battery life without heating requirements, enhancing user convenience and energy efficiency.
Implementation Method 1
a current capture circuit configured to divide a feedback current delivered by the driver... a braking resistor to convert energy
Data Source
AI summary
The invention relates to a feedback current control device and aerial equipment. The feedback current control device includes: a feedback current capture module, located on a current capture circuit and configured to capture a feedback current; a first switch module, configured to turn on or off the current capture circuit; and a control module, including: a first receiving unit, configured to receive a first voltage at one end of the driver and a second voltage at one end of a battery on a feed circuit and a temperature of the battery; and a first control unit, configured to control the first switch module to turn on the current capture circuit for capturing the feedback current when the difference between the first voltage and the second voltage is greater than a preset voltage and the temperature of the battery is less than or equal to a preset temperature.